U.S. patent number 4,036,397 [Application Number 05/720,533] was granted by the patent office on 1977-07-19 for container with easy open top.
This patent grant is currently assigned to Christiana Metals Corporation. Invention is credited to James B. Hall, John G. Thomas, Thomas A. Walraven.
United States Patent |
4,036,397 |
Walraven , et al. |
July 19, 1977 |
Container with easy open top
Abstract
A container adapted to contain a beverage or other goods is
provided with an easy open top by a disk juxtaposed to a hole in
the container lid and welded to the container lid by a ring weld
circumscribing the hole. Access to the contents of the container is
attained by pushing the disk into the container whereby the disk
tears along the weld and does not separate from the lid.
Inventors: |
Walraven; Thomas A. (West
Chester, PA), Thomas; John G. (Berwyn, PA), Hall; James
B. (Chester Springs, PA) |
Assignee: |
Christiana Metals Corporation
(West Chester, PA)
|
Family
ID: |
24894335 |
Appl.
No.: |
05/720,533 |
Filed: |
September 7, 1976 |
Current U.S.
Class: |
220/268;
220/359.4 |
Current CPC
Class: |
B23K
20/10 (20130101); B65D 17/503 (20130101); B65D
17/506 (20130101); B65D 2517/5027 (20130101); B65D
2517/5045 (20130101); B65D 2517/0011 (20130101); B65D
2517/5048 (20130101) |
Current International
Class: |
B23K
20/10 (20060101); B65D 17/00 (20060101); B65D
17/50 (20060101); B65D 041/32 () |
Field of
Search: |
;220/260,265-269,334,339,337,359 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hall; George T.
Attorney, Agent or Firm: Seidel, Gonda & Goldhammer
Claims
We claim:
1. A container adapted to contain a product, a lid for said
container, said lid having at least one hole therethrough, a disk
juxtaposed to the hole and joined thereto by a bond in the form of
an annular loop which circumscribes said hole, means including a
portion of the bond to define a hinge for the disk, a stress
director at a location spaced from the hinge to initiate tearing of
said disk adjacent the ID of said bond as finger pressure is
applied to the disk and causes the disk to move into said container
with said disk remaining connected to the lid at said hinge.
2. A container in accordance with claim 1 wherein the disk is
juxtaposed to the inner surface of the lid.
3. A container in accordance with claim 1 wherein the lid is
juxtaposed to the outer surface of the lid and overlies the hole in
said lid.
4. A container in accordance with claim 1 wherein said disk
overlies a pair of holes in said lid with said bond being discrete
welds circumscribing each hole.
5. A container in accordance with claim 1 wherein said bond is an
ultrasonic weld with the stress director being a portion of the
weld having an apex adjacent the periphery of the hole.
6. A container in accordance with claim 1 wherein said bond is an
ultrasonic weld, the inner peripheral contour of the weld differing
from the peripheral contour of the hole.
7. A container in accordance with claim 6 wherein the width of said
ultrasonic weld at said stress director and at said hinge is wider
than the remainder of the weld.
8. A container adapted to contain a product and having a metal lid
sealed thereto, said lid having at least one hole therethrough, a
metal disk larger than said hole, said disk being juxtaposed to the
hole and joined thereto by a hermetic bond in the form of an
annular ultrasonic weld which circumscribes said hole, the inner
peripheral contour of the weld differing from the peripheral
contour of the hole, means including a portion of the weld defining
a hinge for the disk, said weld including a stress director having
an apex adjacent the periphery of the hole, said stress director
being at a location spaced from the hinge to initiate tearing of
said disk adjacent the ID of said weld as finger pressure is
applied to the disk and causes the disk to move into said container
with said disk remaining connected to the lid at said hinge.
Description
BACKGROUND
Most containers used for soft drinks, beer, food, juices and the
like have an easy access to the contents by way of a pull-off or
tear-off disk. When the disk is separated from the lid of the
container, it constitutes a source of pollution. Occasionally, the
ring or disk is dropped through the opening in the lid into the
contents of the container. Thereafter, the contents of the
container are consumed. When the ring or disk is separate from the
container and is introduced into the container prior to consumption
of the container's contents, there is a danger of the ring or disk
being swallowed.
Thus, there is a need for an easy open top construction for
containers whereby the disk is not separated from the lid when the
contents of the container are available for access, while at the
same time being capable of mass production at reasonable costs.
SUMMARY OF THE INVENTION
In accordance with the present invention, a sealed container is
adapted to contain a product which generally will be liquid in
form. The lid of the container has at least one hole therethrough.
A disk is juxtaposed to the hole with the periphery of the disk
being welded to the lid by an annular weld in the form of a closed
loop which circumscribes the hole in the lid.
One portion of the annular weld is constructed to function as a
hinge for the disk. Another portion of the weld is a stress
director which initiates tearing of the disk adjacent the ID of the
annular weld as finger pressure is applied to the disk and causes
the disk to move into the container while remaining connected to
the lid at said hinge.
It is an object of the present invention to provide a novel easy
open top container capable of being opened by finger pressure but
structurally interrelated so that the disk remains connected to the
lid.
Other objects will appear hereinafter.
For the purpose of illustrating the invention, there is shown in
the drawings a form which is presently preferred; it being
understood, however, that this invention is not limited to the
precise arrangements and instrumentalities shown.
FIG. 1 is a perspective view of a container incorporating the easy
open top construction of the present invention.
FIG. 2 is a plan view of a disk which is used to seal a hole in the
container lid.
FIG. 3 is a plan view of the inner surface of the lid shown in FIG.
1.
FIG. 4 is a diagrammatic illustration of the manner in which the
disk is ruptured to permit access to the contents of the
container.
FIG. 5 is a partial perspective view of the free end of the
torsional reed of an ultrasonic welder.
FIG. 6 is a perspective view of the inner surface of the lid and
disk which has been ruptured as shown in FIG. 4.
FIG. 7 is a top plan view of a lid in accordance with another
embodiment of the present invention.
FIG. 8 is a diagrammatic illustration of the disk being ruptured to
facilitate access to the container in accordance with the
embodiment shown in FIG. 7.
Referring to the drawings in detail, wherein like numerals indicate
like elements, there is shown in FIG. 1 a container designated
generally as 10. The container 10 may contain any one of a wide
variety of products such as beer, soft drinks, juice, etc. The
contents of the container 10 may be pressurized or carbonated, may
be at atmospheric pressure, or may be at a pressure which is
slightly below atmospheric pressure.
The container 10 is made of metal but may be any one of a wide
variety of materials such as tin plated steel, aluminum, etc. The
container 10 has a lid 12 which in turn is provided with an access
hole 14. Access to the contents through hole 14 is prevented by the
disk 16.
The disk 16 may have a variety of different peripheral contours. As
shown in FIG. 2, it is provided with a contour which is circular
and substantially greater in diameter than the hole 14. The disk 16
is juxtaposed to the hole 14 on the inner surface of the lid 12 and
joined thereto by an annular weld 18 which circumscribes the hole
14. The weld 18 includes a portion 20 which acts as a hinge and a
portion 22 which acts as a stress director.
The hinge 20 is a part of the weld 18 but has a shape or
configuration which interrupts the tear path of the weld 18. The
stress director 22 is preferably, but not necessarily,
diametrically opposite the hinge 20 and likewise is a part of the
weld 18. Stress director 22 may project radially toward or away
from the edge of the hole 14 while terminating in a sharp point.
Alternatively, the stress director 22 may intersect the hole 14 in
the lid 12 to provide the stress concentration for tearing at said
intersection. The purpose of the stress director 22 is to create
high shear and/or stress stress concentrations in a localized area
of the disk 16 so as to facilitate the ease of rupturing the disk
16 at a pedetermined point or location.
The disk 16 may be any one of a variety of different materials. It
is preferred to make the disk 16 from aluminum foil. The thinner
the foil, the easier it is to initiate tearing. Typical diameters
for the disk 16 may be from 1/4 inch to 1 inch. Satisfactory
results have been attained by using 3003 H25 aluminum foil having a
thickness of 0.003 inch and 3003 H19 aluminum foil having a
thickness of 0.002 inch.
The annular weld 18, together with its integral hinge 20 and stress
director 22, is preferably an ultrasonic weld attained by a single
impulse using a torsional reed 24 having an end face as shown in
FIG. 5 with ribs on its ID corresponding to elements 20, 22.
Apparatus and methods for applying torsional welds are known to
those skilled in the art of welding. For example, see U.S. Pat.
3,184,841 which discloses apparatus and methods including a
torsionally vibrating element, such as reed 24, adapted for
contacting either the disk 16 or the lid 12 to apply a weld 18
having dimensions corresponding generally to the end face of reed
24. The weld 18 is attained by mechanical vibration having a
frequency of between 59 and 300,000 cycles per second whereby the
peripheral portion of the reed 24 oscillates circumferentially
about its longitudinal axis while engaging either the disk 16 or
lid 12, with the direction of the mechanical vibration delivered by
the peripheral portion of the reed 24 being substantially parallel
to the interface of the disk 16 and lid 12 and with the vibratory
energy being at a sufficient energy level to join disk 16 to lid 12
so as to provide a hermetic seal in the form of weld 18. In view of
the disclosure in said U.S. Pat. No. 3,184,841, it is not deemed
necessary to disclose the other parameters and/or apparatus
involved in applying the ultrasonic weld 18.
As will be noted from the illustration in FIG. 3, the inner
periphery of the hinge 20 is preferably adjacent to the edge of the
hole 14. For purposes of complying with regulations regulating to
the canning of consumable food products, the entire inner surface
of the lid 12 and the disk 22 may be provided with a coating 26.
Coating 26 is preferably the conventional polymeric plastic coating
which is sprayed onto the lid when the container 10 is used for
soft drinks, beer, or other consumable food products which should
not be permitted to be in direct contact with the metal from which
the container and the lid are made. Where, due to the nature of the
contents of the container 10, no such coating 26 is required, it
may be eliminated.
In FIG. 4, there is diagramatically illustrated the lid 12 with a
finger applying pressure to the exposed upper surface of the disk
16 thereby pushing the disk 16 inwardly and exposing the contents
of the container 10. Finger pressure is applied initially adjacent
the stress director 22 which initiates the tearing of the disk 16.
Disk 16 will tear along the ID of the weld 18 and will bend and/or
deform downwardly under finger pressure about the hinge 20 which
does not tear. That is, the tearing action begins at the stress
director 22 and progresses in both directions along the ID from the
stress director to the hinge 20. Since the disk 16 remains inside
the container 10, and attached to the lid 12 at the hinge 20, there
is no danger of swallowing the disk 16 and there is no opportunity
to pollute the environment with disks removed from container lids.
In the event that the disk 16 ruptures at the hinge 20 and
separates from the lid 12, the diameter of the thusly separated
disk is greater than the diameter of hole 14 which prevents or
impedes its removal from within the container 10.
In FIG. 6, there is illustrated the inner surface of the lid 12
with the ruptured disk 16 deflected by a finger as illustrated in
FIG. 4. To prevent the edge of the hole 14 from scraping or cutting
a person's finger, it is preferably rounded or folded back on its
inner surface as shown in FIG. 4 or may be folded back on its outer
surface. It will be noted that the deformed portion of the disk 16
has a notch corresponding generally to the shape of the stress
director 22 which remains as a part of the weld zone on the inner
surface of the lid 12.
As shown in FIG. 3 the hole 14 is circular. In FIG. 7, there is
illustrated the inner surface of a lid 32 in accordance with
another embodiment of the present invention wherein the hole 38 is
pear-shaped. The disk 34 is juxtaposed to the hole 38 and joined
thereto along the weld 36 which incorporates a hinge and stress
director as described above. The weld 36 circumscribes the hole 38.
A coating similar to coating 26 may be applied in the same
manner.
In connection with each of the above embodiments, the disk was
welded to the inner surface of the lid. As shown in FIG. 8, the
disk 16' may be juxtaposed to a hole 14' in the lid 12' while being
welded to the upper or exposed surface of the lid 12'. A slight
bevel 28 may be provided in the lid 12' immediately adjacent the
periphery of hole 14' with rounded edges at the hole 14'. The weld
18' is identical with weld 18 and includes a hinge 20' and an
energy director 22' in the same manner as described above. When the
disk overlies the hole in the lid such as in FIG. 8, the transverse
dimensions of the weld 18' and preferably closer to the transverse
dimensions of the hole as compared to the embodiment of FIGS. 1-6
wherein the disk can be substantially larger than the hole.
In connection with FIG. 8, the portion of the disk 16' which
ruptures along the ID of the weld 18' initially has transverse
dimensions slightly greater than the transverse dimensions of the
hole 14'. The application of finger pressure easily deforms the
disk 16 so as to force it through the hole 14 while the disk
remains secured to the lid 12' at the hinge 20'.
Each of the embodiments disclosed have the same attributes as those
discussed above in connection with FIGS. 1-6. While each embodiment
illustrates the lid as having one hole, it is within the scope of
the present invention to provide two such holes each hermetically
sealed by a disk as described above. When two such holes are
utilized, they are preferably of different sizes with one hole
being an air hole to facilitate entry of air into the container 10
when the contents thereof are poured out through the other
hole.
An example of a lid having more than one hole is shown in FIG. 9
which illustrates a portion of the inner surface of a lid 42 having
a small hole 44 and a larger hole 46. The disk 48 is juxtaposed to
each of the holes 44, 46. An ultrasonic weld 50 circumscribes the
hole 44 and joins the disk 48 to the inner surface of lid 42. A
separate discrete ultrasonic weld 52 circumscribes the hole 46 and
joins the disk 48 to the lid 42. Each of the welds 50, 52 are
provided with a hinge and stress director as described above.
In each embodiment, it is preferred to have the stress director
adjacent a central portion of the lid with the hinge being adjacent
a peripheral portion of the lid. This orientation is a matter of
practicality since there will be a better flow pattern with less
resistance to flow out of the container 10 and less likelihood of
the disk being moved to a partially closed position by the flowing
contents of the container 10.
As pointed out above, the disk may be ultrasonically welded to the
lid or the lid may be ultrasonically welded to the disk depending
upon which is in contact with the torsionally vibrating reed. As
will be apparent from FIGS. 3 and 7, for example, the shape of the
weld need not conform to the shape of the hole in the lid so long
as the weld circumscribes the hole. Where a hermetic seal is not
required, the annular weld may be discontinuous. If desired, the
annular bond may be formed partially with an ultrasonic weld and
partially of some other mechanism such as adhesive.
The present invention may be embodied in other specific forms
without departing from the spirit or essential attributes thereof
and, accordingly, reference should be made to the appended claims,
rather than to the foregoing specification as indicating the scope
of the invention.
* * * * *